Flexible tubing.



G. FISCHER.

FLEXIBLE TUBING.

, 1911 1,055,262, Patented Mar. 4, 1913.

kr 'f 1916 af/a I I I '1 l/ x l r I I I U wm "UNITED STATES PATENT onnron.

CHARLES FISCHER, OF NEW YORK, N. Y.

FLEXIBLE TUBING.

Specification of Letters Patent.

Application filedOctober 28, 1911.

Patented Mar. 4, 1913. Serial no. 657,220.

To all within. it may concern:

Be it known that I, CHARLES FISCHER, a

citizen of the United .States, residing at New York city, in the county and State of New York, have invented certain new and useful Improvements in Flexible Tubing, of which the following is a clear, full, and exact description.

The object of the present invention is to produce an improved non-shrinkable flexile tubing, which, after continued use, will still contain twelve inches to every foot of tubing, and to provide a tubing of this description whose binding sheathing in the form of a helical strip will not tend to unwind, even though out through or worn through at a single point.

In flexible tubings as usuall made the inner core consists of a helix of lI'OIl or steel wire pulled out under tension, so that a space willexist between adjacent convolutions of thehelix of the core, and a winding sheathing of the cross section of a segment of an arc of a circle is tightly wrapped in the space between the convolutions holding the convolutions separated by the binding strip, at the same time permitting a flexing of the tube. This type of flexible tubing however has the great disadvantage that on-wear it will shorten in length due either to the stretching of the outer sheathing or a wearing of the adjacent surfaces of the outer sheathing and the core. Furthermore if worn through at one point the outer sheathing will be caused to unwind,

the core will close up and the tubing become unsightly and dangerous, and useless.

In my invention, I provide a core, preferably of helical resilient iron or steel wire, and a sheathing flat on the outside, but being of sucha cross section that a depending r lug or abutment of the sheathing will always rest between adjacent convolutions of the helix of the core, so as-to prevent any shortening of the same by an expansion of the sheathing, and to prevent an unwinding of the sheathing, no matter how'much wear the sheathing may be subjected to.

- The scope of my invention will be pointed out in the claim.

In the accompanying drawings, Figure 1.

is a side elevation of a section of tubing partly'in section, showing my improved invention. Fig. 2 is an enlarged detailed view of the left hand end, Fig. 1.

In carrying out the invention,.I provide an outer metal sheathing or binding having the cross section preferably such as shown in Fig. 2 provided with a flat outer surface 2, and curved sides 3-3 terminating in .an abutment piece, 4, so that the abutment piece may be forced down between two adjacent convolutions of the helix 1 of the core to separate the same, and to act as an abutment between the two, and prevent the coming together of the two convolutions as well as to prevent the unwinding of the outer sheathing by a wear on its surface. This device may be manufactured by forcing the sheathing between the convolutions of a closed up helix or the helix ma be extended against tension, and the sheat ing wound into place;

I prefer to have the sheathing of the cross section shown in the drawings, so that a concave surface of the abutment will rest against adjacent convolutions of the wires of the core on both sides of a line'drawn between the centers of the adjacent convolutions, so as to provide a part of greater width on the interior of such center line as herein described type 'isregarded as embodying substantial improvements over such modifications.

As many changes could be made in the above construction, and many a parently widely difierent embodiments of t e invention could be made without departing from the scope thereof, it is intended that all matter contained in the above description or shown' in the accompanying drawings .shall be interpreted in an illustrative and not in a limiting sense.

It is furthermore desired to be understood that the language used in the following claim is intended to cover all the gener1c and specific features of the invention herein out this invention, details of described, and all statements of the scope of the invention which as a matter of language might be said to fall therebetween.

I claim as my invention:

A flexible tubing comprising a helical inner core, and a helical outer sheathing therefor having an inwardly extending projection resting between the adjacent convolutions of the core, said projection being slightly enlarged at its end and providing an abutment adapted to engage the'adjacent convolutions of the core at points slightly Signed at New York city, New York, this I 26th day of October 1911.

CHARLES FISCHER.

Witnesses: v

EDWARD D. NEWMAN, GERTRUDE R. SOHIERENBEOK. 

